Chemistry Equilibrium MDCAT 2018
PMDC Verified Question 84 of 102
The product of the concentrations of each ion in saturated solution of a sparingly soluble salt at 298K raised to the power of their relative concentrations is:
A
\( K_{sp} \)
B
\( K_b \)
C
\( K_a \)
D
\( K_w \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \( K_{sp} \)
Concept:

This is the fundamental textbook definition of the Solubility Product Constant.

Formula:

$$ K_{sp} = [M^{+y}]^x [A^{-x}]^y $$

Solution:

  • For a sparingly soluble salt \( M_xA_y \rightleftharpoons xM^{+y} + yA^{-x} \), the equilibrium constant is purely based on aqueous ions.


  • This specific constant is termed \( K_{sp} \) (Solubility Product).


Why other options are incorrect:

\( K_a \) and \( K_b \) represent acid and base dissociation respectively. \( K_w \) is the autoionization constant of water.

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